Dollar Tree / unethical behavior

I have always gone into this Dollar Store (#3048) & never had a problem!
Until earlier tonight (3/2017 @ 7:45pm), where a cashier (Caucasian female, late 20s - early 30s, Overweight status, long, light-hair color) was speaking in such bluntness & crudity, without using any gestures of respect. As she proceeded to verbally abuse the customer out load, (as others heard her humiliate the customer, while the customer attempted to use her credit card).
The cashier was talking to her in condescending mannerism, which I felt totally sad and angry for the victim, who appeared to have a quiet, & reserved demeanor. I hope this pertinent concern will acknowledge management to train their employees accordingly (the cashier is somewhat new...I've seen her before on previous visits). This particular cashier should be disciplined without pay (simply due to her ill-mannered, abrasive interactions with Dollar Tree Customers. I truly believe that this incident is not the first nor will it be the last scenario. Please reconsider this heart-to-heart complaint & place yourself or your love ones/friends, as to how you would feel wholeheartedly, if they were to ever experience such contemptuous, harsh, discourteous wrong doing, as well as representing herself as an employee of Dollar tree.